Determination of mass transfer coefficients in high-pressure CO2-H2O flows in microcapillaries using a colorimetric method

This study presents a method for the experimental determination of local volumetric mass transfer coefficient kLaL in high-pressure two-phase flow water (H2O) and carbon dioxide (CO2) micro-capillary using colorimetric method. H2O CO2 are fed continuously co-axially injected at (10 MPa) moderate temperature (303 K) into microcapillary. Under conditions studied, segmented is formed. The dissolves H2O-rich phase, thereby reducing pH to about 3.3, depending on pressure temperature. phase determined over entire length capillary sensitive indicator coupled with high-speed imaging analysis. concentration water-rich deduced from this value literature data. data unit-cell model, which has been modified account high conditions, have then used determine coefficient, kLaL, liquid along microreactor. experimentally derived ​​ranges between 1 13 s−1.